<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>航运物流系统</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .container {
            text-align: center;
            background: rgba(255, 255, 255, 0.95);
            padding: 50px;
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            width: 500px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .logo {
            margin-bottom: 30px;
        }
        
        .logo h1 {
            color: #333;
            font-size: 32px;
            margin-bottom: 10px;
        }
        
        .logo p {
            color: #666;
            font-size: 16px;
        }
        
        .options {
            margin-top: 30px;
        }
        
        .option-btn {
            display: block;
            width: 100%;
            padding: 15px;
            margin-bottom: 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        
        .option-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }
        
        .ship-icon {
            font-size: 64px;
            color: #667eea;
            margin-bottom: 20px;
        }
        
        .footer {
            margin-top: 30px;
            color: #666;
            font-size: 14px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="ship-icon">🚢</div>
        <div class="logo">
            <h1>航运物流系统</h1>
            <p>基于区块链的物流管理平台</p>
        </div>
        
        <div class="options">
            <a href="user_login.html" class="option-btn">货主登录</a>
            <a href="user_register.html" class="option-btn">货主注册</a>
            <a href="carrier_login.html" class="option-btn">承运商登录</a>
            <a href="carrier_register.html" class="option-btn">承运商注册</a>
        </div>
        
        <div class="footer">
            <p>安全 • 可靠 • 透明</p>
        </div>
    </div>
</body>
</html>